GROUP 1: (temsirolimus with radiation and temozolomide) Patients receive temsirolimus IV over 30 minutes once weekly. Beginning 7-10 days later, patients also receive oral temozolomide daily and undergo concurrent 3-D conformal radiotherapy or intensity-modulated radiotherapy once daily, 5 days a week, for 6 weeks. Patients are evaluated 4-6 weeks after completion of chemoradiotherapy. Patients with stable or responding disease proceed to adjuvant therapy. Cohorts of 3-6 patients receive escalating doses of temsirolimus until the maximum tolerated dose (MTD) is determined. The MTD is defined as the dose preceding that at which 2 of 3 or 2 of 6 patients experience a dose-limiting toxicity. At least 6 patients are treated at the MTD.